The patch titled
sched domain: increase the SMT busy rebalance interval
has been added to the -mm tree. Its filename is
sched-domain-increase-the-smt-busy-rebalance-interval.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: sched domain: increase the SMT busy rebalance interval
From: "Siddha, Suresh B" <suresh.b.siddha@xxxxxxxxx>
With SMT, if the logical processor is busy, load balance happens for every
8msec(min)-16msec(max). There is no need to do this often, as this is just
for fairness(to maintain uniform runqueue lengths) and default time slice
anyhow is 100msec.
Appended patch increases this interval to 64msec(min)-128msec(max) when the
logical processor is busy.
Signed-off-by: Suresh Siddha <suresh.b.siddha@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/linux/topology.h | 2 +-
1 files changed, 1 insertion(+), 1 deletion(-)
diff -puN include/linux/topology.h~sched-domain-increase-the-smt-busy-rebalance-interval include/linux/topology.h
--- a/include/linux/topology.h~sched-domain-increase-the-smt-busy-rebalance-interval
+++ a/include/linux/topology.h
@@ -93,7 +93,7 @@
.groups = NULL, \
.min_interval = 1, \
.max_interval = 2, \
- .busy_factor = 8, \
+ .busy_factor = 64, \
.imbalance_pct = 110, \
.cache_nice_tries = 0, \
.per_cpu_gain = 25, \
_
Patches currently in -mm which might be from suresh.b.siddha@xxxxxxxxx are
i386-add-write_pci_config_byte-to-direct-pci-access-routines.patch
i386-introduce-the-mechanism-of-disabling-cpu-hotplug-control.patch
i386-introduce-the-mechanism-of-disabling-cpu-hotplug-control-cleanup.patch
x86_64-add-genapic_force.patch
fix-the-irqbalance-quirk-for-e7320-e7520-e7525.patch
genapic-optimize-fix-apic-mode-setup.patch
suspend-dont-change-cpus_allowed-for-task-initiating-the-suspend.patch
sched-domain-move-sched-group-allocations-to-percpu-area.patch
sched-domain-increase-the-smt-busy-rebalance-interval.patch
sched-avoid-taking-rq-lock-in-wake_priority_sleeper.patch
sched-remove-staggering-of-load-balancing.patch
sched-disable-interrupts-for-locking-in-load_balance.patch
sched-extract-load-calculation-from-rebalance_tick.patch
sched-move-idle-status-calculation-into-rebalance_tick.patch
sched-use-softirq-for-load-balancing.patch
sched-call-tasklet-less-frequently.patch
sched-add-option-to-serialize-load-balancing.patch
mm-only-sched-add-a-few-scheduler-event-counters.patch
-
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